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  • 1980-1984  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Aspects of renal vascular organization and early vascular tubular relations of the marsupial Isoodon obesulus (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 203 (1982), S. 47-54 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Renal vascular tubular relationships were studied in the marsupial Isoodon obesulus (the common brown bandicoot). The microcirculation was filled with colored silicone rubber by intra-arterial injection of the intact kidney. Nephrons were defined by the injection of silicone rubber of a contrasting color into the space of Bowman's capsule in thick, cleared slices of renal tissue. The details of the vascular tubular relationship in this marsupial are strikingly similar to relationships previously described in true mammalian kidneys. An unusual feature is a wide (600μ) glomerulus-free zone at the outer cortex. This zone contains the proximal and distal convoluted tubules of the most superficial cortical nephrons and is perfused by efferent vessels from glomeruli in superficial strata of the cortex.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092030105
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Three-dimensional strain distributions in upset rings by photoplastic simulation (1981)
    Springer
    Experimental mechanics 21 (1981), S. 361-370 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The changes in internal diameter that occur when a hollow disk, or ring, is plastically deformed by axial compression have been proposed as a method for measuring interface friction during metal forming. The adoption of this test method has been delayed because the three-dimensional strains in such rings are not known. This paper describes how an experimental method using photoplastic simulation was used to obtain the three-dimensional strains for a particular ring geometry. It presents proot of highly nonuniform strains and also shows that the division between flow inward and flow outward occurs at different radii through the thickness of the ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324797
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Material properties in thermal-stress analysis (1981)
    Springer
    Experimental mechanics 21 (1981), S. 295-301 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract With simple techniques and not too-costly laboratory equipment, the significant material properties in modeling transient thermal stresses by photothermoelasticity are evaluated. The results are presented for a room-temperature-cured epoxy, a hot-cured epoxy and a polycarbonate. The materials tested are also evaluated on their applicability to a transient-thermal-stress analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325769
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stress-concentration factors for elliptical holes near an edge (1981)
    Springer
    Experimental mechanics 21 (1981), S. 336-340 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experimental and theoretical stress-concentration factor and stress-intensity factor solutions exist for a large number of hole shapes and configurations. However, little work has been done on the interaction between holes and free edges. This paper reports the results of an experimental study which investigated elliptical holes close to each edge of a tension plate. The holes were symmetric with respect to the longitudinal axis of the models and had their major axes normal to the edge of the plate. The ellipse ratio and the distance between the center and the edge were varied. A statistical model is developed which shows that the stress concentrationK g at both ends of the ellipses is linearly dependent on a geometric function ϕ such thatK g = αΦ + γ. The values for the function ϕ are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326233
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  • 5
    Electronic Resource
    Electronic Resource
    Photothermoelastic analysis of transient thermal stresses (1982)
    Springer
    Experimental mechanics 22 (1982), S. 89-95 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Photothermoelasticity by means of heating is used to obtain an experimental solution to the quasi-static problem of transient thermal stresses around elliptical holes. Empirical equations are obtained for the maximum stresses due to step temperature changes at the edges of the plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325908
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic photoelasticity as an aid in developing new ultrasonic-test methods (1982)
    Springer
    Experimental mechanics 22 (1982), S. 147-154 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A prerequisite for the development of quantitative ultrasonic-inspection techniques for surface flaws is a thorough understanding of the ways in which elastic waves interact with defects. Analytical and numerical approaches are presently inadequate. Experimental methods are needed for a better understanding of wave interactions with real geometries. This paper describes how dynamic photoelasticity was used to study the interaction between Rayleigh waves and slots. To fully interpret the interactions between an incident Rayleigh wave and a surface slot, the problem was subdivided as follows: first, the reflections and mode conversions of a Rayleigh wave at a corner were studied. This simulated the Rayleigh-wave interaction with a slot opening. Then, the interaction when a Rayleigh wave ran off the tip of a slot was observed, and, finally, the total interaction with slots perpendicular to the surface was studied. The results for these three cases are presented. It is suggested that the most important property of a Rayleigh wave that can be used to size surface and near-surface defects is the subsurface particle motions. These motions persist up to a depth of the order of a wavelength. The shape (that is, the frequency spectrum of the transmitted wave) should, therefore, be affected by the depth of the slot. Spectroscopic analysis is applied to the photoelastic data to develop a simple method for sizing slots. Results from ultrasonic tests on slots in steel confirm the validity of the suggested method. By applying contemporary concepts of signal processing to photoelastic data, a powerful new area of experimental investigation is introduced. It promises to overcome the current inability of scatter theories to predict the interactions between real-life defects and acoustic waves as used in ultrasonic testing. Applications of this approach will improve the quantitative ability of ultrasonic-inspection methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325544
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Half-fringe photoelasticity: A new approach to whole-field stress analysis (1983)
    Springer
    Experimental mechanics 23 (1983), S. 304-313 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a new method for whole-field stress analysis based on a symbiosis of two techniques—classical photoelasticity and modern digital image analysis. The resulting method is called ‘half-fringe photoelasticity (HFP)’. Classical photoelasticity demands materials with high birefringence, which leads to extensive use of plastics as model materials. Since the behavior of these materials is often different from that of the prototype materials, their use distorts the similitude relationships. In many contemporary problems this distortion is untenable. HFP offers a way out of this dilemma. It permits materials and loads to be chosen so that no more than one half of a fringe order appears in the area of interest. Thus, for example, glass, which behaves linearly up to high stress levels and over a wide range of temperatures, could be used as model material. Alternatively, models from polymeric materials could be used under very low load in order to stay within the linear part of the stress-strain diagram and to prevent large deformations. The half-fringe-photoelasticity system, which is described here, utilizes the resulting low levels of birefringence for effective stress analysis. This paper describes the system. It outlines a calibration routine and illustrates its application to two simple problems using glass models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319257
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic wave propagation in a single lap joint (1980)
    Springer
    Experimental mechanics 20 (1980), S. 162-166 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dynamic photoelasticity was used to study the stresses when an impulse wave propagates through a single lap joint. An explosive was detonated in one of the adherends. The resulting stress wave propagated down the adherend and through the joint area. At the junction between the adherends, the stress wave interacted with the ends of the adherends and significant changes in the stress wave occurred. The stress wave then propagated through the joint and, in doing so, interacted with the two square corners at the adhesive/adherend interface. It was found that a significant biaxial tensile stress occurs at one of the corners. With only the usual black and white photographs, the ordering and interpretation of the photoelastic-fringe orders was difficult. The paper indicates how color photographs were used to simplify identification of the fringes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327119
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Three-dimensional strains in rolled slabs by photoplastic simulation (1982)
    Springer
    Experimental mechanics 22 (1982), S. 441-447 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small polyester billets are used to model the deformations that occur during the hot rolling of slabs of aluminum. The billets are rolled to a retained reduction of around 11 percent. They are then sliced along principal planes and the three-dimensional strains are plotted over a transverse cross section of the deformed billet. The extent of this nonuniformity in the strains is clearly shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325421
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    Paper (German National Licenses)
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